Kirchoff's law Question

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Malsch

Joined Mar 19, 2011
23
Hi, I was trying to understand how the transfer function is derived from a sallen-key topology using this pdf on page 2: http://www.vyssotski.ch/BasicsOfInstrumentation/AnalysisOfTheSallen-KeyArchitecture.pdf

He starts by using kirchoffs law to obtain equations at certain points. What i was wondering is, at equation 1, how does the author conclude to such results when kirchoffs law states that at a node, all the currents are equal to zero.

Thanks
 

Jony130

Joined Feb 17, 2009
5,155
Look at those two figures.

The first diagram shows I Kirchhoff's law.

a2.PNG


Current entering the node must be equal the current that is leaving the node.

And this diagram shows II Kirchhoff Law

1a.PNG
 
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